Markham Ravine Bridge at Nicolaus Road Structure Strengthening
Summary
SCH Number
2005078055
Public Agency
City of Lincoln
Document Title
Markham Ravine Bridge at Nicolaus Road Structure Strengthening
Document Type
NOE - Notice of Exemption
Received
Posted
7/8/2005
Document Description
The proposed project is the emergency structural strengthening of the existing Markham Ravine Bridge (Bridge No. 19C-0199R) on Nicolaus Road approximately 0.25 mile east of Nelson Lane in the City of Lincoln. The existing bridge consists of two travel lanes in each direction with a natural landscaped median. Markham Ravine crosses beneath the westbound travel lanes and landscape median via a large corrugated culvert. No culvert occurs beneath the eastbound travel lanes. The south side of the bridge (eastbound travel lanes) has visible excessive deflection.
The existing bridge was constructed in 1930 and widened in 1950. The original structure is a single span reinforced concrete arched soffit slab on diaphragm abutments (20 feet wide). The widening is a single span reinforced concrete slab on steel girders supported by seat abutments (12 feet-8 inches wide).
On May 20, 2005 Caltrans performed an inspection of the structure and found the original portion of the structure (inside eastbound travel lane) exhibiting a large amount of deflection. Due to rapid deterioration, Caltrans had previously recommended that this structure be closed. Caltrans is now recommending closing the inside eastbound lane until a midspan support can be placed.
The proposed project includes developing a traffic handling plan to divert traffic from the inside eastbound lane to the outside eastbound lane during emergency repair work activities. Structure strengthening will consist of placing precast concrete pads on channel bottom and placing timber corbels to support the deficient section of bridge deck. This is an accepted method of temporary support which Caltrans has used in the past as an interim structural solution. Upon completion of emergency strengthening activities the eastbound travel lanes will be re-opened.
Following emergency repair work, a long-term solution will be developed and the use Highway Bridge Rehabilitation and Replacement (HBRR) funding to replace the structure will be evaluated. Bridge replacement would be subject to separate CEQA compliance documentation.
Contact Information
Name
Carl Walker
Agency Name
City of Lincoln
Contact Types
Lead/Public Agency
Phone
Email
Location
Cities
Lincoln
Counties
Placer
Notice of Exemption
Exempt Status
Statutory Exemption
Type, Section or Code
Public Resources Code 21080.33
Reasons for Exemption
Project consists of emergency repair to Markham Ravine Bridge at Nicolaus Road likely damaged by gradual earth movement over time. All repair work would be conducted within the existing road right-of-way and would be completed within one year of the recordation of the damage.
Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above.